<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
 <head>
  <title>Case sensitivity</title>
  <style type="text/css">
 .cs { color: green; }
 .cs P { background: red; color: yellow; }
 .cs .a { background: red; color: yellow; }
 .cs .span1 span { background: red; color: yellow; }
 .cs .span2 { color: red; }
 .cs .span2 SPAN { color: green; }
 .cs .span2 span { background: red; color: yellow; }
 .ci { color: red; }
 .ci P { background: green; color: white; }
 .ci .a { background: green; color: white; }
 .ci .span1 span { background: green; color: white; }
 .ci .span2 SPAN { background: green; color: white; }
</style>
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 </head>
 <body>
<div>


 <div class="ci">
   <p>This line should be green.</p>
   <p class="A">This line should be green.</p>
   <p><SPAN>This line should be green.</SPAN></p>
 </div>

</div>
</body>
</html>